| 1 | /* |
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| 2 | * wrapper exp2(x) |
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| 3 | */ |
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| 4 | |
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| 5 | #include <math.h> |
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| 6 | #include <math_private.h> |
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| 7 | #include <math-svid-compat.h> |
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| 8 | #include <libm-alias-double.h> |
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| 9 | |
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| 10 | #if LIBM_SVID_COMPAT && (SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) \ |
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| 11 | || defined NO_LONG_DOUBLE \ |
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| 12 | || defined LONG_DOUBLE_COMPAT) |
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| 13 | double |
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| 14 | __exp2_compat (double x) |
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| 15 | { |
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| 16 | double z = __ieee754_exp2 (x); |
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| 17 | if (__builtin_expect (!isfinite (z) || z == 0, 0) |
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| 18 | && isfinite (x) && _LIB_VERSION != _IEEE_) |
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| 19 | /* exp2 overflow: 44, exp2 underflow: 45 */ |
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| 20 | return __kernel_standard (x, x, 44 + !!signbit (x)); |
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| 21 | |
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| 22 | return z; |
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| 23 | } |
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| 24 | # if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_29) |
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| 25 | compat_symbol (libm, __exp2_compat, exp2, GLIBC_2_1); |
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| 26 | # endif |
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| 27 | # ifdef NO_LONG_DOUBLE |
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| 28 | weak_alias (__exp2_compat, exp2l) |
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| 29 | # endif |
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| 30 | # ifdef LONG_DOUBLE_COMPAT |
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| 31 | /* Work around gas bug "multiple versions for symbol". */ |
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| 32 | weak_alias (__exp2_compat, __exp2_compat_alias) |
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| 33 | |
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| 34 | LONG_DOUBLE_COMPAT_CHOOSE_libm_exp2l ( |
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| 35 | compat_symbol (libm, __exp2_compat_alias, exp2l, FIRST_VERSION_libm_exp2l), ); |
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| 36 | # endif |
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| 37 | #endif |
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| 38 | |
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